Version 4
SHEET 1 880 680
WIRE 208 -176 64 -176
WIRE 384 -176 208 -176
WIRE 432 -176 384 -176
WIRE 384 -160 384 -176
WIRE -224 -80 -656 -80
WIRE -80 -80 -144 -80
WIRE 208 -32 208 -176
WIRE -224 32 -448 32
WIRE -80 32 -80 -80
WIRE -80 32 -144 32
WIRE 64 32 64 -176
WIRE 208 80 208 48
WIRE 288 80 208 80
WIRE 352 80 288 80
WIRE 560 80 416 80
WIRE 592 80 560 80
WIRE -448 96 -448 32
WIRE 208 112 208 80
WIRE -80 160 -80 32
WIRE -32 160 -80 160
WIRE 64 160 64 112
WIRE 64 160 32 160
WIRE 112 160 64 160
WIRE 144 160 112 160
WIRE 64 192 64 160
WIRE 560 192 560 80
WIRE -656 224 -656 -80
WIRE 208 256 208 208
WIRE 208 256 160 256
WIRE 240 256 208 256
WIRE 160 272 160 256
WIRE 160 352 160 336
WIRE 208 352 160 352
WIRE 240 352 240 336
WIRE 240 352 208 352
WIRE -656 384 -656 304
WIRE -448 384 -448 176
WIRE -448 384 -656 384
WIRE 64 384 64 272
WIRE 64 384 -448 384
WIRE 208 384 208 352
WIRE 208 384 64 384
WIRE 560 384 560 272
WIRE 560 384 208 384
WIRE 592 384 560 384
WIRE 208 400 208 384
FLAG 208 400 0
FLAG 384 -80 0
FLAG 288 80 Uc
FLAG 112 160 Ub
FLAG 592 80 Ua
SYMBOL npn 144 112 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL res 224 240 R0
SYMATTR InstName R1
SYMATTR Value 213
SYMBOL cap 144 272 R0
SYMATTR InstName C3
SYMATTR Value 0pF
SYMBOL res 192 -48 R0
SYMATTR InstName R2
SYMATTR Value 2.2k
SYMBOL res 48 16 R0
SYMATTR InstName R3
SYMATTR Value 47k
SYMBOL res 48 176 R0
SYMATTR InstName R4
SYMATTR Value 4.7k
SYMBOL voltage 384 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 20
SYMBOL cap 416 64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100nF
SYMBOL cap 32 144 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100nF
SYMBOL res 544 176 R0
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL voltage -448 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 1m 100000 0 0 +90)
SYMBOL res -128 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 100
SYMBOL voltage -656 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value SINE(0 1m 100000 0 0 -90)
SYMBOL res -128 -96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 100
TEXT -96 424 Left 2 !.tran 0 4.2m 0